CN103589990A - Novel composite blackening process - Google Patents
Novel composite blackening process Download PDFInfo
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- CN103589990A CN103589990A CN201310482661.8A CN201310482661A CN103589990A CN 103589990 A CN103589990 A CN 103589990A CN 201310482661 A CN201310482661 A CN 201310482661A CN 103589990 A CN103589990 A CN 103589990A
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- nitriding
- blackening process
- novel process
- compound
- novel
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Abstract
The invention discloses a novel composite blackening process. The novel composite blackening process comprises the steps of short-time nitriding and oxidation blackening. According to the novel process of combining the short-time nitriding and the oxidation blackening, a Fe3N-Fe3O4 two-phase layer can be formed on the surface of a part. The novel composite blackening process has the advantages of corrosion resistance, abrasion resistance, attractive color, durability and wide application.
Description
Technical field
The invention belongs to chemical treatment method field, metallic surface, specifically, is the novel process about a kind of compound blackening process.
Background technology
The main flow process of common black-emitting technology is: deoil → pickling → blackout → saponification → immersion oil.Its chemical feedstocks mainly using is NaOH, NaNO
2and Na
3pO
4, and these three kinds of chemical feedstockss are generated to Fe at 145 ℃ to piece surface
3o
4passive film, makes it play corrosion protection effect attractive in appearance.Yet there is following defect in the method: (1) can not carry out blackening process to some material, such as spheroidal graphite cast iron etc.; (2) not good enough to some material blackout quality, there is the rubescent piebald look that has in part for example; (3) through overpickling part, easily produce hydrogen embrittlement Fe+H
2sO
4→ FeSO
4+ H
2↑.Therefore, be necessary existing black-emitting technology to improve, make it overcome above-mentioned defect.
Summary of the invention
In order to overcome deficiency of the prior art, present inventor improves existing blackening, the new technology that has adopted novel short time nitriding and oxidation blackout to combine, the part after art breading of the present invention can reach color and luster attractive in appearance, anti-corrosion, be out of shape little advantage.
Therefore, the object of the present invention is to provide a kind of novel process of compound blackening process.
In order to achieve the above object, the present invention is realized by following technical scheme:
A novel process for compound blackening process, comprises the step that short time nitriding and oxidation are turned black.
According to the present invention, the novel process of described compound blackening process comprises the steps: to clean for the first time → preheating → short time nitriding → oxidation blackout → cleaning → immersion oil for the second time.
According to the present invention, described cleaning is for the first time cleaned for part is placed in to nitriding scavenging solution.
According to the present invention, described preheating is by part preheating 18-22min at 365-375 ℃.
According to the present invention, described short time nitriding is carried out short time nitriding processing 30-35min for part being placed at 520-570 ℃ to nitriding salt bath.
According to the present invention, described nitriding salt comprises Li
2cO
3, Na
2cO
3, K
2cO
3, (NH
2)
2cO and K
2s.
According to the present invention, described oxidation blackout is oxidized 20-25min for part being placed at 370-375 ℃ to saline oxide bath.
According to the present invention, described saline oxide comprises NaOH.
According to the present invention, described cleaning is for the second time cleaned for part is placed in to water.
According to the present invention, described immersion oil is for to be dipped in part in slushing oil.
Beneficial effect: the present invention combines short time nitriding and oxidation black-emitting technology, compare with existing black-emitting technology, have advantages of that consistency is good, color and luster is attractive in appearance, durable in use and suitability is wide, blackout quality is good, and part, without rubescent and piebald look, also can be processed materials such as spheroidal graphite cast iron, compare with common nitridation technique, have that infiltration layer is shallow, the time is short, be out of shape micro-feature, play wear-resisting and anti-corrosion effect, can form Fe at piece surface
3n and Fe
3o
4two-phase layer, does not produce hydrogen embrittlement, is specially adapted to accurate wear-resisting and require the part of certain surface quality attractive in appearance.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.Should be understood that following examples are only for the present invention is described but not for limiting scope of the present invention.
The nitriding salt using in following examples and saline oxide are purchased from the Jiu Xing of Anqiu City, Shandong heat treatment material company limited, and the main component of described nitriding salt is Li
2cO
3, Na
2cO
3, K
2cO
3, (NH
2)
2cO and micro-K
2s, the main component of described saline oxide is NaOH.Described nitriding scavenging solution is purchased from Shanghai Pu Zha Materials Company.
The novel process of compound blackening process of the present invention comprises the steps: to clean for the first time → cleaning → immersion oil of preheating → short time nitriding → oxidation blackout → for the second time.After pending part is placed in to nitriding scavenging solution and cleans at 365-375 ℃ preheating 18-22min.Then part is placed at 520-570 ℃ to nitriding salt bath and carries out short time nitriding processing 30-35min, the main component of described nitriding salt is Li
2cO
3, Na
2cO
3, K
2cO
3, (NH
2)
2cO and micro-K
2s.Part is placed at 365-375 ℃ to saline oxide bath again and is oxidized 20-25min, the main component of described saline oxide is NaOH.Finally part is placed in after water cleans and is dipped in slushing oil.
With typical material 45
#steel and 40Cr are example, and the surface color of the part after art breading of the present invention, density and hardness performance are detected, and result is as follows:
Surface color: shiny black, not rubescent, without piebald;
Density: through 10%CuSO
4solution titration, redfree copper is separated out, and illustrates that infiltration layer is compact and complete;
Hardness: surpass 500HV.
The novel process of compound blackening process of the present invention makes part first in nitridation salt, carry out nitrogenize in short-term, generates Fe
3n, has played anti-corrosion and wear-resisting effect, and then generates again Fe while being oxidized
3o
4, there is dual anti-corrosion effect, and whole process does not have H
2produce, so reduced the possibility of hydrogen embrittlement, membrane formation mechanism reaction is as follows: 2Fe+O
2→ 2FeO; 4CNO
-→ CO
3 2-+ 2CN
-+ CO+2[N]; 6FeO+2[N] → 2Fe
3n+3O
2; FeO+ strong oxidizer → Fe
3o
4.Therefore, short time nitriding of the present invention and the novel process that oxidation blackout combines, can form Fe at piece surface
3n and Fe
3o
4two-phase layer, have advantages of anti-corrosion, wear-resisting, color and luster is attractive in appearance, durable in use, suitability is wide.
Claims (10)
1. a novel process for compound blackening process, is characterized in that, comprises the step of short time nitriding and oxidation blackout.
2. the novel process of compound blackening process as claimed in claim 1, is characterized in that, comprises the steps: to clean for the first time → preheating → short time nitriding → oxidation blackout → cleaning → immersion oil for the second time.
3. the novel process of compound blackening process as claimed in claim 2, is characterized in that, described cleaning is for the first time cleaned for part is placed in to nitriding scavenging solution.
4. the novel process of compound blackening process as claimed in claim 2, is characterized in that, described preheating is by part preheating 18-22min at 365-375 ℃.
5. the novel process of compound blackening process as claimed in claim 2, is characterized in that, described short time nitriding is carried out short time nitriding processing 30-35min for part being placed at 520-570 ℃ to nitriding salt bath.
6. the novel process of compound blackening process as claimed in claim 5, is characterized in that, described nitriding salt comprises Li
2cO
3, Na
2cO
3, K
2cO
3, (NH
2)
2cO and K
2s.
7. the novel process of compound blackening process as claimed in claim 2, is characterized in that, described oxidation blackout is oxidized 20-25min for part being placed at 370-375 ℃ to saline oxide bath.
8. the novel process of compound blackening process as claimed in claim 7, is characterized in that, described saline oxide comprises NaOH.
9. the novel process of compound blackening process as claimed in claim 2, is characterized in that, described cleaning is for the second time cleaned for part is placed in to water.
10. the novel process of compound blackening process as claimed in claim 2, is characterized in that, described immersion oil is for to be dipped in part in slushing oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482661.8A CN103589990A (en) | 2013-10-15 | 2013-10-15 | Novel composite blackening process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482661.8A CN103589990A (en) | 2013-10-15 | 2013-10-15 | Novel composite blackening process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103589990A true CN103589990A (en) | 2014-02-19 |
Family
ID=50080299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310482661.8A Pending CN103589990A (en) | 2013-10-15 | 2013-10-15 | Novel composite blackening process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103589990A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886890A (en) * | 2016-06-20 | 2016-08-24 | 马鞍山市益丰实业集团有限公司 | Abrasion-resistant ductile cast iron ball preparation method |
| CN107177817A (en) * | 2017-03-31 | 2017-09-19 | 江苏科技大学 | It is a kind of while improving the handling process of carbon steel corrosion stability and wearability |
| CN108034920A (en) * | 2017-12-22 | 2018-05-15 | 刘珍 | A kind of method of automobile wheel hub surface blackening process |
| CN109763092A (en) * | 2018-12-24 | 2019-05-17 | 钢铁研究总院 | A kind of surface treatment method enhancing oil gas fracturing unit truck pump housing corrosion-proof wear |
| CN111142203A (en) * | 2019-12-26 | 2020-05-12 | 江苏英杰光缆科技有限公司 | Method for improving flexibility of optical cable |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101580926A (en) * | 2009-07-06 | 2009-11-18 | 青岛张氏机械有限公司 | Salt-bath heat treatment technology of piston rod |
-
2013
- 2013-10-15 CN CN201310482661.8A patent/CN103589990A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101580926A (en) * | 2009-07-06 | 2009-11-18 | 青岛张氏机械有限公司 | Salt-bath heat treatment technology of piston rod |
Non-Patent Citations (1)
| Title |
|---|
| 周鼎华: "QPQ技术的盐浴调整和维护", 《热处理》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886890A (en) * | 2016-06-20 | 2016-08-24 | 马鞍山市益丰实业集团有限公司 | Abrasion-resistant ductile cast iron ball preparation method |
| CN107177817A (en) * | 2017-03-31 | 2017-09-19 | 江苏科技大学 | It is a kind of while improving the handling process of carbon steel corrosion stability and wearability |
| CN108034920A (en) * | 2017-12-22 | 2018-05-15 | 刘珍 | A kind of method of automobile wheel hub surface blackening process |
| CN109763092A (en) * | 2018-12-24 | 2019-05-17 | 钢铁研究总院 | A kind of surface treatment method enhancing oil gas fracturing unit truck pump housing corrosion-proof wear |
| CN109763092B (en) * | 2018-12-24 | 2020-04-24 | 钢铁研究总院 | Surface treatment method for enhancing corrosion resistance and wear resistance of oil-gas fracturing truck pump body |
| CN111142203A (en) * | 2019-12-26 | 2020-05-12 | 江苏英杰光缆科技有限公司 | Method for improving flexibility of optical cable |
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Application publication date: 20140219 |